Vat dye.



"UNITED sirATas manna carton.

LUETWIG WOLMAN, '13 ELBERFELD, GERMANY, ASSIGNOR TO FARBENFABRIKEN VORM.

BAYER & (30., 0F ELIBERFELD, GERMANY, A CORPORATION 0F GERMANY.

VAT BYE.

To all whom it may concern:

lie it known that I, LUnwIo lVOLMAN, doctor of philosophy, chemist, citizen of the German Empire, residing at. Elberfeld, Germany, have invented new and useful Improvements in Vat Dye, of which the followin a specification.

lily invention relates to the production of new anthracene derivatives. They are obtained by converting an aminoanthraquinone into its derivatives containing in the amino group the radical of an anthraquinone carboxylic acid (O, ,l:i,() .CO). The reaction is carried out by treating an aminoantlu'aquinonc with an 'anthraquinone carboxylic acid.

The new products are after being dried and pulverized colored powders practically insoluble in water; soluble in concentrated sulfuric acid with from a yellow to red color. 'lhey yield on treatment. with hydrosulfite and caustic soda lye brownish vats suitable for dyeing and printing;- the textile fiber from yellow to red to brown shades. They also Form valuable lakes,

In order to illustrate the new processI can proceed as follows, the parts being by wcight:l() parts of anthraquinone-EZ-carhoxylic acid'are heated with 200 parts of nitrobenxcne and (3 parts of SOCl to 140 C. After cooling to 100 C. parts of 1- an1i1ioanthraquinone are added and the mixture is heated for 1-2 hours to 110120 C. The new condensation product crystallizes from the cooling melt in the shape of yellow crystals which are filtered oft, washed with alcohol and water and dried. They are soluble in pyridin with a yellow color, in concentrated sulfuric acid'with a yellow color. 5y treatment with hydrosulfite and NaOH a brownish vat is'obtained which dyes cotton, wool or silk pure greenish-yellow shades.

Specification of Letters Patent.

Other aminoanthraquinones or other anthraquinone carboxylic-acids may be used.

Products of similar qualities are thus obtained, e. g. from 1.4-diaminoanthraquiilone and anthraquinone-Q-carboxylic acid (dyes reddish -brown), from 1.5 -diaminoanthraquinone and anthraquinone-2-carboxylic acid r Patented Get. 5, race.

Application filed May 29, 1909. Serial No. 499,146. I

tained from an aminoanthraquinone and an anthraquinone carboxylic acid, which dyestutls are, after being dried and pulverized, colored powders practically insoluble in water, soluble in concentrated sulfuric acid with a yellow to red color; giving brownish vats with hydrosulfite and caustic soda lye, which vats dye the textile fibertrom yellow to red to brown shades, substantially as described.

2. The herein described new vat dyestutl' of the anthracene series which is the anthraquinonyl carbonyl 1 aminoanthraquinone, which dyestufi' is, after being dried and pulverized, a yellow powder which is soluble in pyridin with a yellow color; soluble in concentrated sulfuric acid with a yellow color; giving a brownish vat with hydrosulfite and caustic soda lye, which vat dyes the textile fiber greenish-yellow shades, substantially as described.

In testimony whereof I have hereunto set my hand in the presence of two subscribing witnesses.

LUDW 1G WOLlllAN. Witnesses O'r'ro KoNro, lViLLY KLEIN. 

